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58-Limon silty clay loam, saline. This deep, well <br />drained soil is on stream terraces. It formed in clayey <br />alluvium. Slopes are 0 to. 1 percent. The native <br />vegetation is mainly grasses. Elevation is 5,000 to <br />5,400 feet. The average annual precipitation is 11 to 13 <br />inches, the average annual air temperature is 51 to 53 <br />degrees F, and the average frost-free period is 140 to <br />170 days. <br />The surface layer is typically brown silty clay loam <br />about 3 inches thick. The substratum to a depth of 60 <br />inches or more is clay. The soil is moderately alkaline <br />to a depth of 3 inches and is strongly alkaline below <br />that depth. <br />Included with this soil in mapping are areas of <br />Gaynor soils generally adjacent to uplands. These soils <br />are moderately deep. They make up about 5 percent of <br />the unit. Also included are areas of .Limon soils that are <br />generally slightly saline or moderately saline. <br />Permeability is slow in the Liman soil. Available water <br />capacity is moderate. Effective rooting depth is 60 <br />inches or more. Runoff is slow, and the hazard of water <br />erosion is slight. This soil is subject to rare, very brief <br />periods of flooding in the spring and early summer. <br />When the soil is dry, cracks form that are 1 inch wide <br />and 4 to 72 inches deep. <br />Most areas of this soil are used as rangeland. A few <br />areas are used as irrigated cropland. Hay and pasture <br />are the main irrigated crops. <br />The potential plant community is mainly alkali <br />sacaton, western wheatgrass, blue grama, and fourwing <br />saltbush. The average annual production of air-dry <br />vegetation is about 1,000 pounds per acre. If the <br />condition of the range deteriorates, black greasewood, <br />fourwing saltbush, and inland saltgrass increase. The <br />main limitations affecting range seeding are poor filth of <br />the natural topsoil and shallow wetting of the soils by <br />natural precipitation. <br />If this soil is used for irrigated crops, the main <br />limitations are the slow permeability and the poor filth. <br />Unless irrigation water is properly managed, the soil <br />also is subject to the concentration of salts in the root <br />zone. <br />Irrigation water can be applied by corrugation or by <br />flooding from contour ditches. Sprinkler irrigation is <br />generally not suitable because the intake rate is very <br />slow after the initial application. Because of the slow <br />permeability, the applications of water should be <br />regulated so that water does not stand on the surface <br />and damage the crops. <br />Fertilizer is needed to ensure the optimum growth of <br />grasses and legumes. Grazing when the soil is wet <br />results in compaction of the surface layer, poor filth, <br />and excessive runoff. If properly managed, this soil can <br />p' 'uce 4 tons of irrigated alfalfa hay per acre. <br />ment, the <br />If this soil is used for homes~te deve o <br />ermeability and a high <br />main limitations ace the slow p a constant <br />shrink-swell potential. The effects of shrinking and <br />swelling can be reduced by maintaining The design of <br />moisture content around the foundat~on• <br />wafts should offset the effects <br />foundations and bearing BackfiUing the excavation wish <br />of shrinking and swelling. otential can also <br />material that has a low shrink-swe P <br />and swefling. <br />reduce the effects of shrinking <br />Conventional septic tank absorption fields do not <br />uatefy because of theQ assrposaf systems <br />function adeq es of sewag <br />permeability. Other typ ated, and Vts, <br />should be used. a site. <br />The capability classification fs Ills, irrig <br />nonirrigated. The soil is in the Salt Flat ;f34 rang <br />